Radical Grace/the Lutheran Difference

You know how the old hymn goes.My hope is built on nothing less than Me and my obedienceCause John MacArthur told me soI know the path that I must goOn works the solid rock I standAll other ground is sinking sand"Now to the one who does not work, but trusts God who justifies the wicked, his faith is credited as righteousness". The Letter the Romans, the fourth chapter.